论文标题
昏迷集群中软过量排放的异想天开
A WHIM origin for the soft excess emission in the Coma cluster
论文作者
论文摘要
本文对昏迷簇的ROSAT观察结果进行了新的分析，以确定超过热簇内培养基的贡献的软X-射线辐射的量。通过对热的内部培养基进行了高分辨率研究，XMM-NEWTON和PLANCK望远镜可以通过群集的病毒半径进行重新分析。该分析证实了强烈的软X-射线辐射的原始发现，这可能是热源。我们发现在流体动力学模拟中观察到的热人层间培养基（WIM）细丝之间检测到的软过量和体格特征之间的定量一致。我们得出的结论是，对软过剩的最合理的解释是$ \ sim 10 $ 〜mpc-长的细丝，$ \ log t（k）\ simeq 6 $，带有baryon overdrodendone $ \ sim 300 $，收敛于昏迷群。因此，如数值模拟所预测的那样，这种解释为识别带有异想天开的缺失的低 - 红色 - 红色速度重子。
This paper provides a new analysis of ROSAT observations of the Coma cluster, to determine the amount of soft X--ray radiation in excess of the contribution from the hot intra--cluster medium. The re--analysis is made possible by a high--resolution study of the hot intra--cluster medium with the XMM-Newton and Planck telescopes out to the cluster's virial radius. The analysis confirms the original findings of a strong excess of soft X--ray radiation, which is likely to be of thermal origin. We find quantitative agreement between the detected soft excess and the physical characteristics of warm--hot intergalactic medium (WHIM) filaments seen in hydrodynamical simulations. We conclude that the most plausible explanation for the soft excess is the presence of $\sim 10$~Mpc--long filaments at $\log T(K)\simeq 6$, with a baryon overdensity $\sim 300$, converging towards the Coma cluster. This interpretation therefore provides support for the identification of the missing low--redshift baryons with WHIM filaments, as predicted by numerical simulations.
